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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4fac1b5bf391cf641a8a308285ca96a62fe5be9b51340bd195bc2525e2e017' 
  AND token = '9/vNVJjTaT1xrV64SWocLGZrvazNR0iG7rnk+kCxfD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}